For the acronyms, HOO stands for Hydrogen/Oxygen/Oxygen, or Ha/OIII/OIII. It is a particular kind of narrow band blend that gives a "natural" look from a color standpoint (hydrogen gas to reddish or pinkish, oxygen gas to a blue or cyan.)

SHO stands for Sulfer/Hydrogen/Oxygen or SII/Ha/OIII. This is another kind of narrow band blend that is definitely "false color" in that hydrogen-alpha, which is definitely a red emission, is mapped to green. This is also sometimes called the Hubble Palette, as it is the standard blending palette often used for official hubble image reproductions.

The underlying data here is the same...I've just blended the information in different ways to give it a different look.

Canon 40D & 7D

Living up in the Northwest, our availability of clear weather is limited to the summer, and then we have a lot of light contamination from Spokane, starting about 10 miles South of us. We are in the country, as far as the neighborhood, but not away from the city light.

I've been up in Northern British Columbia, 100 miles from anything but tiny villages, and its truly amazing what you can see on a clear night. Astrophotography would be a great hobby up there.

Eastern Oregon is also a great area for dark-night sky viewing/pictures. Especially the south-eastern corner of the state - south and east of Malheur Wildlife Refuge for example - think Owyhee river and/or Steens Mountain...

EOS 80D

I've invested in a (relatively) cheap guiding setup since we last spoke. Haven't had much chance with it due to crappy weather we've been getting but with what little time I've had to muck around with it so far I seem to get pretty good results with 2 min subs on ~500mm FOV (crop body + 200mm + 1.4x TC) on the Star Adventurer.